EP0607154B1 - Convertisseur d'energie selon le principe du moteur a air chaud - Google Patents

Convertisseur d'energie selon le principe du moteur a air chaud Download PDF

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Publication number
EP0607154B1
EP0607154B1 EP92914900A EP92914900A EP0607154B1 EP 0607154 B1 EP0607154 B1 EP 0607154B1 EP 92914900 A EP92914900 A EP 92914900A EP 92914900 A EP92914900 A EP 92914900A EP 0607154 B1 EP0607154 B1 EP 0607154B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
energy converter
crankshafts
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92914900A
Other languages
German (de)
English (en)
Other versions
EP0607154A1 (fr
Inventor
Stig G. Carlqvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAARTECH HYDRAULIK GmbH
Stig G Carlqvist Motor Consultant AB
Original Assignee
Saarberg Hydraulik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saarberg Hydraulik GmbH filed Critical Saarberg Hydraulik GmbH
Publication of EP0607154A1 publication Critical patent/EP0607154A1/fr
Application granted granted Critical
Publication of EP0607154B1 publication Critical patent/EP0607154B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
    • F01B7/02—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons
    • F01B7/04—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons acting on same main shaft
    • F01B7/06—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons acting on same main shaft using only connecting-rods for conversion of reciprocatory into rotary motion or vice versa
    • F01B7/10—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons acting on same main shaft using only connecting-rods for conversion of reciprocatory into rotary motion or vice versa having piston-rod of one piston passed through other piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
    • F16H21/18—Crank gearings; Eccentric gearings
    • F16H21/22—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric
    • F16H21/32—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric with additional members comprising only pivoted links or arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
    • F02G2243/02—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes having pistons and displacers in the same cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2254/00—Heat inputs
    • F02G2254/30—Heat inputs using solar radiation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2270/00—Constructional features
    • F02G2270/42—Displacer drives
    • F02G2270/425—Displacer drives the displacer being driven by a four-bar mechanism, e.g. a rhombic mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2270/00—Constructional features
    • F02G2270/85—Crankshafts

Definitions

  • the invention relates to an energy converter based on the principle of the hot-air engine (Stirling engine, Ericsson engine), which has a cylinder that contains a working piston and a displacement piston, which can be moved back and forth on the axis of the cylinder and each have a piston rod device, each with a joint system is connected via connecting rods to two parallel cranks rotating synchronously in opposite directions in such a way that the displacer piston is moved out of phase with the working piston.
  • Stirling engine Ericsson engine
  • a known such Stirling-type energy converter has a so-called rhombic crank mechanism (see, inter alia, US-A-3,220,177).
  • the piston rod of the working piston is tubular, and an upper yoke is attached to it, which is located between the cylinder and the plane in which the two parallel cranks lie.
  • Two connecting rods, each of which is connected to one of the cranks, engage with pins in the ends of the upper yoke, so that a reciprocating movement of the working piston of the cylinder and thus also of the yoke causes synchronous rotation of the crankshafts in opposite directions.
  • the piston rod of the displacer extends through the tubular piston rod of the working piston, and a lower yoke is attached to it, which, relative to the cylinder, is located behind the plane of the cranks.
  • the connecting rods are rotatably attached, which engage in their respective crank on the same crank pin as the corresponding connecting rod of the upper yoke.
  • the lower yoke and thus the displacement piston also move back and forth in the opposite direction during the synchronous rotation of the cranks, but their movement is out of phase in relation to the upper yoke.
  • the phase shift occurs because the connecting rods are directed obliquely outwards from the yokes and towards each other from the various yokes.
  • This mechanism also known as a rhombic gear mechanism, uses plain bearings that are lubricated with oil.
  • a special circulation lubrication system is used, to which an oil pump and oil channels belong to the various lubrication points, which makes the energy converter more complicated and more expensive.
  • the oil lubrication means that the crankcase of the energy converter with the rhombic crank mechanism has to be hermetically sealed against the cylinder of the energy converter so that the working gases in the cylinder do not mix with oil, which leads to harmful contamination of the heat exchanger in the energy converter leads. This seal is difficult to achieve due to the high pressure of the working gas required and requires the use of expensive and complicated seals.
  • permanently lubricated roller bearings are used instead of the oil-lubricated plain bearings, which do not require a special circulation lubrication system. This applies in particular to the design of small, single-cylinder energy converters, where the cost aspect plays a more prominent role and the lower friction of the roller bearings has noticeably positive effects.
  • the invention has for its object to provide a powerful single-cylinder energy converter, the bearings have a long life without external lubrication.
  • the joint system of the working piston comprises a frame element which has at least four pins which are arranged in a common plane perpendicular to the cylinder axis symmetrically to the cylinder axis and are aligned parallel to the crankshafts and on each of which is connected to a connecting rod, that the joint system and / or the piston rod device of the displacement piston is or are passed through the frame element and that the cranks are designed as crankshafts, on which the connecting rods each engage a crank, which are each arranged between two crankshaft bearings.
  • the proposed solution can be applied to a diamond gear.
  • all crankshaft crankings are the same.
  • crankshaft crankshafts connected to the joint system of the working piston and the crankshafts connected to the joint system of the displacer piston are angularly offset in accordance with the different movements which the two pistons are to carry out.
  • a combination of both principles is also conceivable, even only partially.
  • the offset cranks also have the advantage in connection with the frame element that both joint systems can work on the crankshafts from the same side.
  • the joint system of the displacement piston preferably a yoke with two connecting rods, has space and space in the frame element of the working piston. The entire device can thereby become more compact, an important advantage for the flexible use of the energy converter.
  • the piston rod device of the working piston expediently consists of two piston rods which are fastened symmetrically to the cylinder axis on the working piston.
  • the Stirling engine 1 has a cylinder 2, in which a displacement piston 3 and a working piston 4 are arranged. 1 and 2, heat pipes 5 can be seen, which are located in a combustion chamber, not shown, and connect the cylinder space above the displacer 3 to the outside of an annular regenerator 6, which surrounds the cylinder 2. The inside of the regenerator 6 is connected to a chamber in which a cooler 7 is arranged, which in turn is connected to the cylinder space under the displacement piston 3.
  • crankshafts 9 are arranged symmetrically to the axis of the cylinder 2 and at right angles to it.
  • crankshaft cranks has three offsets 14, 15, 16 between four bearings 10, 11, 12, 13.
  • the bends 14 and 15 are arranged in one plane with one another, while the third bend 16 is aligned at an angle to them.
  • the crankshaft crank arrangement is mirror symmetrical to a plane that extends through the cylinder axis.
  • the middle crank 16 is rotatably connected to the one connecting rod eye of a connecting rod 17, the other connecting rod eye of which rotatably engages a pin 18 arranged on a yoke 19.
  • the yoke 19 is mirror-symmetrical to the plane of the cylinder axis and the pins 18 at its ends are aligned parallel to the crankshafts 9.
  • a piston rod 20 is rigidly attached, which extends coaxially and sealed through the working piston 4 and is attached to the underside of the displacement piston 3.
  • crankings 14 and 15 of the crankshaft 9 are rotatably connected to the one connecting rod eye each of a connecting rod 21, the other connecting rod eye of which rotatably engages on a pin 22, 23 arranged on a frame element 24.
  • the frame element 24 is mirror-symmetrical to the plane of the cylinder axis and the pins 22 and 23 are arranged in pairs and aligned parallel to the crankshafts 9.
  • the distance between the pairs of pins 22, 23 assigned to the various crankshafts 9 and the distance between the pins 18 from one another is the same as the distance that the crankshafts 9 have from one another in their bearings 10-13.
  • the frame element 24 is designed as a very stiff framework with a central opening that is large enough to allow unimpeded passage of the yoke 19 in the direction of the cylinder axis.
  • two piston rods 25 are attached, which lie in one plane with the cylinder axis and which are parallel to one another are arranged at the same distance from this axis.
  • the piston rods 25 extend, like the piston rod 20, sealed by a wall that allows a different gas pressure in the cylinder space of the engine and in the crankshaft space, and are connected to the underside of the working piston 4.
  • All bearings 10, 11, 12, 13 and the connecting rod bearings are encapsulated, permanently lubricated roller bearings that are completely maintenance-free and, thanks to the large number of bearings, are only exposed to low bearing loads, which gives them a long service life.
  • a hood could be attached to the crankcase 8 in a pressure-tight manner, in which the crankshafts 9 each drive a generator, for example. All moving parts are then encapsulated.
  • the Stirling engine shown is primarily intended for stationary use and can be used, for example, to drive a generator that is coupled to its crankshafts.
  • a structural unit with an integral multiple arrangement of the Stirling engine would also be possible, possibly in a tandem arrangement with rigidly connected frame elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transmission Devices (AREA)
  • Control Of Electric Motors In General (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Synchronous Machinery (AREA)
  • Fuel Cell (AREA)
  • Actuator (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Drying Of Solid Materials (AREA)

Claims (5)

  1. Convertisseur d'énergie selon le principe du moteur à air chaud (moteur Stirling, moteur Erisccon), qui comporte un cylindre (2), contenant un piston de travail (4) et un piston déplaceur (3), qui sont mobiles respectivement en avant et en arrière sur l'axe du cylindre (2) et possèdent respectivement un dispositif de tiges de piston (20, 25), qui sont reliées au moyen respectivement d'un système articulé (21-24 ou 17-19) par des bielles (17, 21) à deux manivelles (9) parallèles, (vilebrequin) tournant de manière synchrone dans deux directions opposées, de façon que le piston déplaceur se déplace déphasé par rapport au piston de travail, caractérisé en ce que :
    - le système articulé (21, 24) du piston de travail (4) comporte un élément de cadre (24) rigidement relié à son dispositif de tiges de piston (25), élément de cadre qui comprend au moins quatre tourillons (22, 23), disposés symétriquement par rapport à l'axe du cylindre dans un plan commun orthogonal par rapport à l'axe du cylindre et dirigés parallèlement aux vilebrequins (9) et sur lesquels est articulée une bielle (21), en ce que le système articulé (17, 19) et/ou le dispositif de tiges de piston (20) du piston déplaceur (3) est ou sont guidés à travers l'élément de cadre (24) et,
    - en ce que les manivelles sont formées en vilebrequins (9) sur lesquels agissent les bielles (17, 21) respectivement sur un coude (16, 14, 15), placé entre deux paliers de vilebrequins (11, 12).
  2. Convertisseur d'énergie selon la revendication 1, caractérisé en ce que les coudes (14, ou 16 et 15) des vilebrequins(9) reliés au système articulé (21-24) du piston de travail (4) et reliées au système articulé du piston déplaceur (3) sont décalés angulairement les uns par rapport aux autres.
  3. Convertisseur d'énergie selon les revendications 1 ou 2, caractérisé en ce que le dispositif de tiges de piston (25) du piston de travail (4) comporte deux tiges de piston, qui sont fixées au piston de travail (4) symétriquement par rapport à l'axe du cylindre.
  4. Convertisseur d'énergie selon les revendications 1 ou 2, caractérisé en ce que les systèmes articulés et les vilebrequins sont disposés ensemble avec un générateur relié aux deux vilebrequins ou chacun d'eux avec un générateur relié aux vilebrequins dans un boîtier d'ensemble étanche, qui est rempli de gaz, avec lequel travaille le convertisseur d'énergie.
  5. Convertisseur d'énergie selon une des revendications 1 à 4, caractérisé en ce que tous les paliers nommés (10-13, 14-16, 18, 22, 23) sont des paliers à rouleaux ou des paliers à aiguilles à graissage permanent.
EP92914900A 1992-07-09 1992-07-09 Convertisseur d'energie selon le principe du moteur a air chaud Expired - Lifetime EP0607154B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/001556 WO1994001670A1 (fr) 1992-07-09 1992-07-09 Convertisseur d'energie selon le principe du moteur a air chaud

Publications (2)

Publication Number Publication Date
EP0607154A1 EP0607154A1 (fr) 1994-07-27
EP0607154B1 true EP0607154B1 (fr) 1996-09-18

Family

ID=8165667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92914900A Expired - Lifetime EP0607154B1 (fr) 1992-07-09 1992-07-09 Convertisseur d'energie selon le principe du moteur a air chaud

Country Status (9)

Country Link
US (1) US5983636A (fr)
EP (1) EP0607154B1 (fr)
JP (1) JP3130942B2 (fr)
AT (1) ATE143096T1 (fr)
DE (1) DE59207206D1 (fr)
DK (1) DK0607154T3 (fr)
ES (1) ES2094360T3 (fr)
GR (1) GR3022064T3 (fr)
WO (1) WO1994001670A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7007470B2 (en) 2004-02-09 2006-03-07 New Power Concepts Llc Compression release valve
US7308787B2 (en) 2001-06-15 2007-12-18 New Power Concepts Llc Thermal improvements for an external combustion engine
US7310945B2 (en) 2004-02-06 2007-12-25 New Power Concepts Llc Work-space pressure regulator
US7654084B2 (en) 2000-03-02 2010-02-02 New Power Concepts Llc Metering fuel pump
US7934926B2 (en) 2004-05-06 2011-05-03 Deka Products Limited Partnership Gaseous fuel burner
US8006511B2 (en) 2007-06-07 2011-08-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8069676B2 (en) 2002-11-13 2011-12-06 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8282790B2 (en) 2002-11-13 2012-10-09 Deka Products Limited Partnership Liquid pumps with hermetically sealed motor rotors
US8359877B2 (en) 2008-08-15 2013-01-29 Deka Products Limited Partnership Water vending apparatus
US8511105B2 (en) 2002-11-13 2013-08-20 Deka Products Limited Partnership Water vending apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69819730T2 (de) * 1997-07-15 2004-09-30 New Power Concepts Llc Brennverfahren
US6536207B1 (en) 2000-03-02 2003-03-25 New Power Concepts Llc Auxiliary power unit
US6827104B2 (en) * 2001-10-24 2004-12-07 Mcfarland Rory S. Seal and valve systems and methods for use in expanders and compressors of energy conversion systems
US6606860B2 (en) 2001-10-24 2003-08-19 Mcfarland Rory S. Energy conversion method and system with enhanced heat engine
US11826681B2 (en) 2006-06-30 2023-11-28 Deka Products Limited Partneship Water vapor distillation apparatus, method and system
US11884555B2 (en) 2007-06-07 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
WO2014018896A1 (fr) 2012-07-27 2014-01-30 Deka Products Limited Partnership Commande de la conductivité dans une sortie d'eau de production destinée à un évaporateur

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
FR1213644A (fr) * 1958-12-10 1960-04-01 Dispositif d'embiellage à double effet pour moteurs à explosion, notamment ceux du cycle à quatre temps
DK103727C (da) * 1960-06-22 1966-02-14 Philips Nv Varmgasstempelmaskine og anlæg med et antal sådanne maskiner.
NL271492A (fr) * 1961-11-16
US3431788A (en) * 1967-03-01 1969-03-11 Philips Corp Piston rod guide for rhombic drive stirling cycle apparatus
NL154311B (nl) * 1969-04-17 1977-08-15 Philips Nv Inrichting, bevattende twee coaxiaal opgestelde, ten opzichte van elkaar axiaal beweegbare elementen, waarbij de afdichting tussen deze elementen is gevormd door een rolmembraan.
DE4034162C1 (fr) * 1990-10-26 1992-06-04 Michael L. 8830 Treuchtlingen De Zettner
SE467792B (sv) * 1991-01-10 1992-09-14 Carlqvist Stig G Motor Consult Energiomvandlare

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7654084B2 (en) 2000-03-02 2010-02-02 New Power Concepts Llc Metering fuel pump
US7308787B2 (en) 2001-06-15 2007-12-18 New Power Concepts Llc Thermal improvements for an external combustion engine
US8069676B2 (en) 2002-11-13 2011-12-06 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8282790B2 (en) 2002-11-13 2012-10-09 Deka Products Limited Partnership Liquid pumps with hermetically sealed motor rotors
US8511105B2 (en) 2002-11-13 2013-08-20 Deka Products Limited Partnership Water vending apparatus
US7310945B2 (en) 2004-02-06 2007-12-25 New Power Concepts Llc Work-space pressure regulator
US7007470B2 (en) 2004-02-09 2006-03-07 New Power Concepts Llc Compression release valve
US7934926B2 (en) 2004-05-06 2011-05-03 Deka Products Limited Partnership Gaseous fuel burner
US8006511B2 (en) 2007-06-07 2011-08-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8359877B2 (en) 2008-08-15 2013-01-29 Deka Products Limited Partnership Water vending apparatus

Also Published As

Publication number Publication date
JPH06510835A (ja) 1994-12-01
WO1994001670A1 (fr) 1994-01-20
ES2094360T3 (es) 1997-01-16
US5983636A (en) 1999-11-16
EP0607154A1 (fr) 1994-07-27
ATE143096T1 (de) 1996-10-15
DK0607154T3 (da) 1997-01-13
JP3130942B2 (ja) 2001-01-31
GR3022064T3 (en) 1997-03-31
DE59207206D1 (de) 1996-10-24

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